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This article in JEQ

  1. Vol. 40 No. 2, p. 647-652
    OPEN ACCESS
     
    Received: July 21, 2010
    Published: Mar, 2011


    * Corresponding author(s): acarpi@jjay.cuny.edu
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doi:10.2134/jeq2010.0327

An Investigation of the Kinetic Processes Influencing Mercury Emissions from Sand and Soil Samples of Varying Thickness

  1. Jason L. Quinones and
  2. Anthony Carpi *
  1. Dep. of Sciences, John Jay College, The City Univ. of New York, 445 West 59th St., New York, NY 10019. Assigned to Associate Editor Rainer Schulin

Abstract

Mercury flux from HgCl2–treated sand and untreated soil samples of varying thickness (0.5–15 mm) were measured in dark and light under a Teflon dynamic flux chamber. Mean emissions over a 5.5-d sampling period showed an increase with depth for sand samples between 0.5 and 2 mm, but increasing depth above 2 mm had no effect. First-order kinetic models showed strong goodness of fit to the data and explained a high degree of variability in the emissions profile of all sand samples (R 2 = 0.70–0.98). Soil samples showed an initial emissions peak that was not correlated with depth, suggesting a very shallow process at work. However, longer-term “baseline” emissions, measured as mean emissions between Days 4.5 and 5.5, did show a relationship with depth. First-order kinetic models showed good fit for soil samples up to 4 mm thick (R 2 = 0.66–0.91); however, thicker samples did not show a consistent fit to first- or second-order kinetic models (1° R 2 = 0.00–0.46; 2° R 2 = 0.00–0.54). The data suggest that mercury emissions from soil samples may follow a multicomponent model for which more than one component is affected by incident radiation.

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Copyright © 2011. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyAmerican Society of Agronomy, Crop Science Society of America, and Soil Science Society of America